What is Computer Virus ??

A computer virus is malicious code that replicates by copying itself to another program, computer boot sector or document and changes how a computer works. The virus requires somebody to intentionally or unwittingly spread the contamination without the information or permission of a client or framework administrator. In contrast, a computer worm is stand-alone programming that does not need to copy itself to a host program or require human interaction to spread. Viruses and worms may also be referred  to as malware.

A virus can be spread by opening an email attachment, tapping on an executable document, visiting a contaminated site or survey a tainted site advertisement. It can also be spread through tainted removable storage gadgets, such USB drives. When a virus has tainted the host, it can contaminate other framework software or assets, alter or disable core capacities or applications, as well as copy, erase or encode data. Some viruses start replicating as soon as they taint the host, while different viruses will lie dormant until a particular trigger causes malicious code to be executed by the gadget or framework.

Many viruses also include evasion or obfuscation capabilities that are designed to bypass modern antivirus and antimalware software and other security defenses. The rise of polymorphic malware advancement, which can dynamically change its code as it spreads, has also made viruses more hard to recognize and distinguish.

Types of Computer Virus 

• Boot Sector Virus 
• Direct Action Virus 
• Resident Virus
• Multipartite Virus
• Polymorphic Virus
• Overwrite Virus
• Spacefiller Virus

Boot Sector Virus -This type of virus infects the master boot record and it is challenging and a complex task to remove this virus and often requires the system to be formatted. Generally it spreads through removable media.

Direct Action Virus - This is also called non-resident virus, it gets installed or stays covered up in the computer memory. It stays attached to the particular type of documents that it contaminate. It does not affect the user experience and system's performance.

Resident Virus - Unlike direct action viruses, occupant viruses get installed on the computer. It is hard to recognize the virus and it is even hard to remove an resident virus.

Multipartite Virus - This type of virus spreads through multiple ways. It infects both the boot sector and executable documents at the same time.

Polymorphic Virus - These type of viruses are hard to relate to a traditional anti-virus program. This is because the polymorphic viruses alters its signature pattern at whatever point it replicates.

Overwrite Virus - This type of virus erases all the documents that it infects. The main conceivable mechanism to remove is to erase the contaminated records and the end-client has to lose all the substance in it. Recognizing the overwrite virus is troublesome as it spreads through emails.

Spacefiller Virus - This is also called "Cavity Viruses". This is called so as they occupy the vacant spaces between the code and subsequently does not cause any damage to the record.

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